Manner of sustaining logs in sawmills



UNITED STATES PATENT FFICE..

JEREMIAH ROI-IRE-R, VOF ROHRERSVILLE, MARYLAND,

MANNER OF SUSTAINING LOGS I-N SAWMILLS.

Specification of Letters Patent No. 2,114, dated May 29, 1841.

To all whom, @'25 may concern Be it known that I, JEREMIAH Bonner, ot Rohrersville, in the county of lVashington and State ot' Maryland, have made an improvement in the manner of constructing sawmills, which improvement consists in the employment and adaptation of two rollers, which are used to brace and sustain the stuff which is being sawed,n one of them pressing against the lower and the other against the upper part of the log or stuita and I do her-eby declare that the following is a full and exact description of the man ner in which I construct my improved mill.

The general construction of th-e frame work of my mill, and the manner of operating the saw, and of governing the other movements thereof, do n ot differ from such as are in common use, my improvement relating exclusively to the sustaining of the legs by means oi the two rollers, which is particularly necessary in the sawing of light and small stuff.

In the accompanying drawing, Figure l, is a vertical section through the middle of the mill; the saw being omitted, and only such parts shown as are necessary to the illustration of my improvements.

A, A, is the log to be sown, and B, and C, the head and tail blocks upon which it rests; D, D, are the ends of the carriage.

E, is the roller which is to bear against the lower, and F, that which is to bear against the upper side of the log. A view o1" these rollers, and of a part of the apparatus connected with them, as they would be seen from the end of the mill, is shown in Fig. 2. The upper roller F, is supported above the log by the frame work of the mill house, or by a frame for the purpose resting on its sills.

Gr, G, are two upright post-s, support-ing a frame I-I, H, which sustains the sliding piece I, on the lower end of which sliding piece is the roller F. This piece rests against the stationary piece J, and it can be raised at any time b y the tender of the mill, by means of the card K, passing over a pulley L, I make the slide I, in two pieces, which are hinged together at e; when the log` is being drawn back, this hinged part will yield to the motion, and take off the pressure of the roller from the log.

The roller E, which sustains the log on its lower side, revolves in a sliding frame b, which frame rises and falls between suitable guide pieces, or cheeks, c, 0,' the piece CZ, of this slidingl frame, when the roller E, is in Contact with the log, rests upon the end of a sliding bar e, and when this is withdrawn the roller will descend by its own gravity; the withdrawal of the sliding bar e, is et'- fected by a self-acting apparatus, in the following manner. The sliding rod e, is attached at one end to a vibrating lever f, and when the upper end of this comes into contact with a desc-ending piece g, on the bottom of the carriage, the sliding bar-e, will be withdrawn, and the roller E, will descend, and the rear end of the log can then pass over the roller, and be acted upon by the saw. Then the roller E, is to be again made to bear upon the bottom of the log, it is raised up in the following manner.

M, is a lever working on a fulcrum at 7L; and z', a rope, or cord, attached by one end to this lever, and by the other to the sliding frame b; this cord passes over a pulley j, and it is manif-est that under this arrangement, if the end 7c, of the lever M, be depressed, the sliding frame b, Y), will be raised and the sliding bar e, may again pass under it; to cause it to do so, this bar may be acted upon by a spring, or by a weight, or it may be so fixed as to do so by the gravity of the lever f. A rod, or bar, of wood N, may be used by the tender of the mill to bear upon the end 7c, of the lever M, when the roller E, is to be raised,

I-Iaving thus fully described the nature ot my invention, and shown the arrangement by which the same is carried into operation, what I claim therein and desire to secure by Letters Patent, is-

1. The manner in which I have arranged and combined the two rollers for making pressure upon the upper and lower parts of a log when being sawed in a saw-mill.

2. I am aware that a single roller has been used for supporting a log, but this has not been made to operate in the manner de scribed by me, nor do I know, or believe, that there has previously existed any combination similar to that herein described, by which two rollers were made to cooperate in sustaining the stug. I do not claim, therefore, the employment of a single roller under the log; but I do claim the manner in which I have made the lower roller to opnaton with the upper roller, operating as erate, by causing' the same to rise and fall herein described. vertically, and to be made selfoperating' when it is to be removed from under the log,

5 the respective parts thereof being con- Witnesses:

structed and arranged substantially in the WASHINGTON McCoy, manner set forth and being' used in combi- DAVID ROHRER.

JEREMIAH ROHRER. 

